Glass forming roll



July 7, 1 931. BQUDIN 1,813,142

GLASS FORMING ROLL Filed June 25, 1928 INVENITOR. 100/5 Baum/v A TTORNEYS.

Patented-filly], 1931 I -um'rao s'rA as PATENT OFFICE LOUIS 301mm; or en eonam, rmcr, ASSIGNOR-TO SOGIE'I'E Aiionm nEs mo- FACTURES nrs omens a 230mm cmmuns 1m SAINT-Germ, cum &'

CIREY, OF PARIS, FRANGE GLASS FORMING ROLL Application meiiu e as, 1928, Serial so. 288,118, and in France June so, 1927.

Sheet glass may be formed by the continuous or intermittent process and either by a rolling apparatus in which the sheet lass is formed between two rollers or one rol er and l a flat rolling. table. The uniformity of interval between the rollers on one hand, and the roll and table on the other hand, deter- I mines the uniformity of thiclmess of the sheet formed. It therefore follows that the 1 thickness of the formed sheet will. only be uniform when the forming apparatus 1s of 4 such va constructionthat heat from the .molten glass can not warp the. forming mechanism. I Water-cooled rolls heretofore used with a view of absorbing 'the heat from the glass have suffered from the defect that air pockets tend to form therein adjacent to the inner surface of the rolls, with the result that the surface of the rolls is not maintained at uniform temperature, thus. causing a warpin of the rolls.

11 order to overcome the disadvantages pointed out above, I propose to supply a cooling medium, preferably in the form of water, through a fitting in the bearing of a roll, and by the interior construction of the roll direct the coolin medium to the inner periphery of the rofi and thereafter flow 3 the cooling medium in a cent the entire 'formin to besubsequently disc 'sorbed heat, through the other bearin of the roll, and this is a construction in w ich no air pocketsfcan form. Referring now to the drawin Fi re 1 is a longitudinal section through a r0 embodying myinvention. Figure 2 1s 'a transverse section on line 2-2 of Figure 1;

Figure 3 is an elevation of the shell which is used to; define the path of the cooling medium.- j

Figure 4 is a modified showing of Figure 3.

1 In" the drawings, A represents a ollow roll whose outer surface sha' es'the molten glass, and B a cylindrical s ellv forming a surface of the roll core within the same, and which;1 with the e path in The roll is inner surfaces of the rollforms t 0 which tlre'coolingmedium flfows.

straight path adjaarged with the abmounted on trunnions D and F fitting bearings and G. Theshell B has on each end thereof spacers O which serve to'center I I into the roll A. The shell B has the shell I on its end adjacent the intake, a conical head I, which diverts, with slight resistance, the

cooling medium,- and' causes it to follow the straight path formed by the inner surface.

the roll, and the outer surface of the shell.

of In order to prevent the formation currents or pockets by reason of changes in the direction of flow of the cooling medium, the inner diameter of the trunnion D has its interior flared at H. It will of eddy be noted that the interior of the trunnion F which serves as the exit for the cooling medium, is as large as the inner diameter -0 the roll, so that the cooling medium moves in a straight line from its entrance within the roll to the exit therefrom. I

If the roll is of large diameter; the outer surface of the shell can be rovided as shown in Figure 4 with ribs K which may be either 10h itudinal or helicoidal, so as to cause all of t e stream lines of the cooling medium to come into contact with the interior of the roll A.. It. is also to be noted, in connection with very large rolls, that the hollow cylindrical shell B will decrease the weight: of the roll becauseof the fact that this shell which it displaces.

wei hs'less than the water romsthe above description and drawings,

it will be seen that a supply of coolin medium, preferably water, Wlll' be connected to the threaded fitting L on the trunnion D of the roll, and thereafter will flow through the trunnion until it meets the conical portion I of the shelLB, which will direct the water through the roll in the space formed by the exterior of the shell B and the interior of the roll A. The 'cooledmedium will go through the rollin intimate contact with the interior of the wall-thereof throughout its entire forming surface, the. cooling medium will be in intimate contact with portions of the roll subjected to the reatest heat. his to be noted that the cooling during its entire passage throug changes which means that medium,

in direction, which means that the greatest amount of cooling medium can, and will pass through the roll in a given time and also that all portions of the cooling medium travel at the same speed. This means also that none of the cooling medium or air con- 1 tained therein may become entrapped, and that all portions of the forming surface of the roll have the same temperature through out, which is essential for the formation of good glass sheets.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is 1. The combination in a glass forming roll of a hollow core body having a c lindncal s ace therein, of a cylindrical s ell inserte from one end of said roll and having a conical head adjacent to the opposite end of said roll, with means for introducing cooling fluid at the last named end' of the roll.

2. The combination with a roll having trunnions upon the ends thereof and having an interior cavity of substantially uniform diameter from the outer end of one trunnion to adjacent the opposite end of the roll, an induction member havin a conical end in the last named end of t e roll, and a cylindrical core within the roll having a conical head ad acent to the induction member and spacing members adapted to center the core within the roll.

3. A hollow glass forming roll having means for induction and eduction thereto I and therefrom of a cooling medium, the

interior of the roll being cylindrical and hollow and of uniform diameter from ad acent to the induction end to the eduction end, said hollow space being divided by a plurality of ribs on a hollow closed core.

In testimony whereof I hereunto aflix my signature. I LOUIS BOUDIN. 

